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CVE-2026-66788— Lighthouse: lighthouse: arbitrary local-namespace injection via attacker-controlled labelsourcenamespace

Quick assessment

Affected
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

发现 Lighthouse 中存在一个漏洞。远程攻击者通过入侵 spoke 集群，可以利用该漏洞：其漏洞在于，资源注入的目标命名空间来源于对 broker 对象上由攻击者控制的标签或注解的解析。这使得攻击者能够向对等集群中的任意命名空间（包括 kube-system 和 openshift-* 等关键系统命名空间）注入恶意的 EndpointSlices 和 ServiceImports。此漏洞可能导致集群内的权限提升或其他形式的系统被入侵。

CVSS 9.9 · Critical EPSS 0.29% · P22

Affected Version Matrix 4

VendorProduct Version RangeStatus
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 any affected
any affected
any affected
any affected
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I. Basic Information for CVE-2026-66788

Vulnerability Information
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Vulnerability Title
Lighthouse: lighthouse: arbitrary local-namespace injection via attacker-controlled labelsourcenamespace
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Lighthouse. A remote attacker, by compromising a spoke cluster, can exploit a vulnerability where the destination namespace for resource injection is derived from an attacker-controlled label or annotation on the broker object. This allows the attacker to inject unauthorized EndpointSlices and ServiceImports into any namespace on peer clusters, including critical system namespaces like kube-system and openshift-*. This could lead to privilege escalation or other forms of system compromise within the cluster.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 - cpe:/a:redhat:acm:2
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 - cpe:/a:redhat:acm:2
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 - cpe:/a:redhat:acm:2
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 - cpe:/a:redhat:acm:2

II. Public POCs for CVE-2026-66788

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III. Intelligence Information for CVE-2026-66788

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Vendor Advisories for CVE-2026-66788 (2)

Same Patch Batch · Red Hat · 2026-08-20 · 16 CVEs total

CVE-2026-67567 9.9 CRITICAL Multicloud-operators-subscription: multicloud-operators-subscription: helmrelease chart ap
CVE-2026-66785 9.9 CRITICAL Submariner: submariner: unvalidated endpoint.spec.subnets propagated into wireguard allowe
CVE-2026-11861 9.6 CRITICAL Freeipa: idm: ipa: freeipa: obtaining tgs with impersonating cname through trust relations
CVE-2026-13097 9.1 CRITICAL Ipa: privilege escalation via krbcanonicalname manipulation due to realm-unaware uniquenes
CVE-2026-66787 8.7 HIGH Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice and servi
CVE-2026-77176 8.1 HIGH Kata-containers: insufficient validation of createcontainer mount and storage rules in gen
CVE-2026-18917 7.8 HIGH Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflow
CVE-2026-19582 7.8 HIGH Binutils: stack buffer overflow in gnu binutils in rsrc_print_name from an untrusted pe fi
CVE-2026-73137 7.7 HIGH Multicloud-operators-subscription: multicloud-operators-subscription: cross-namespace secr
CVE-2026-73198 7.5 HIGH Ipa: freeipa: unauthenticated dos in `/ipa/i18n_messages` via unbounded request body read
CVE-2026-73197 7.5 HIGH Ipa: freeipa: unauthenticated dos in `/ipa/migration/migration.py` via unbounded request b
CVE-2026-19611 7.4 HIGH Wildfly-elytron: org.wildfly.security/wildfly-elytron-password-impl: wildfly-elytron: pass
CVE-2026-73199 6.5 MEDIUM Ipa: freeipa: null pointer dereference in `ipa-enrollment` extended operation (`join_oid`)
CVE-2026-77014 5.3 MEDIUM Libsoup: libsoup: integer truncation in sort_ranges() comparator causes silent omission of
CVE-2026-73196 4.3 MEDIUM Ipa: freeipa: authenticated dos in `otptoken-add` via unbounded otp key decoding/re-encodi

IV. Related Vulnerabilities

Same product: Red Hat Advanced Cluster Management for Kubernetes 2
Same vendor: Red Hat
Same weakness: CWE-284

V. Comments for CVE-2026-66788

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